<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">
  <title>test</title>
  <style>
    #loading-mask {
      display: block;
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
      z-index: 10;
      background: rgba(247, 248, 249, 0.6);
    }

    #loading-index {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 150px;
      text-align: center;
      z-index: 11;
    }

    #loading-index>div {
      width: 30px;
      height: 30px;
      background-color: #409eff;

      border-radius: 100%;
      display: inline-block;
      -webkit-animation: bouncedelay 1.4s infinite ease-in-out;
      animation: bouncedelay 1.4s infinite ease-in-out;
      /* Prevent first frame from flickering when animation starts */
      -webkit-animation-fill-mode: both;
      animation-fill-mode: both;
    }

    #loading-index .bounce1 {
      -webkit-animation-delay: -0.32s;
      animation-delay: -0.32s;
    }

    #loading-index .bounce2 {
      -webkit-animation-delay: -0.16s;
      animation-delay: -0.16s;
    }

    @-webkit-keyframes bouncedelay {

      0%,
      80%,
      100% {
        -webkit-transform: scale(0);
      }

      40% {
        -webkit-transform: scale(1);
      }
    }

    @keyframes bouncedelay {

      0%,
      80%,
      100% {
        transform: scale(0);
        -webkit-transform: scale(0);
      }

      40% {
        transform: scale(1);
        -webkit-transform: scale(1);
      }
    }
  </style>
</head>

<body>
  <div id="loading-mask">
    <div id="loading-index">
      <div class="bounce1"></div>
      <div class="bounce2"></div>
      <div class="bounce3"></div>
    </div>
  </div>
  <div>webpack4 test</div>
  <script src="js/jquery-3.2.1.min.js" type="text/javascript"></script>
</body>
</html>